case presentation this case concerns a 3-year-old girl whose medical history includes an acid attack suffered 3 years ago. she began treatment for the restoration of her scalp hair, but five weeks later, she presented at our clinic with a high-grade fever and infectious discharge from the commissure of the skull following a scalp expansion graft. microbiologic and radiologic work-ups were condu...

Beyond skill, beliefs in requisite abilities and expectations can affect performance. This experiment examined effects of induced perceptions of ability to perform well under generic situations of challenge. Participants (N = 31) first completed one block of 20 trials on a throwing accuracy task. They then completed questionnaires ostensibly measuring individual differences in the ability to pe...

The accuracy of throwing in games and sports is governed by how errors in planning and initial conditions are propagated by the dynamics of the projectile. In the simplest setting, the projectile path is typically described by a deterministic parabolic trajectory which has the potential to amplify noisy launch conditions. By analysing how parabolic trajectories propagate errors, we show how to ...

We examined whether the combination of two factors that have consistently been found to enhance motor learning - an external focus (EF) of attention and autonomy support (AS) - would produce additive benefits. Participants practiced throwing with their non-dominant arm. In a 2×2 design, they were or were not asked to focus externally (i.e., on the target), and were or were not given a choice (a...

Two factors that have been shown to facilitate motor learning are autonomy support (AS) and enhanced expectancies (EE) for performance. We examined the individual and combined influences of these factors. In a 2 × 2 design, participants learning a novel motor skill (throwing with the non-dominant arm) were or were not provided a choice (AS) about the ball color on each of 6 10-trial blocks duri...

Performance assessment has become an invaluable component of monitoring participant's development in distinct sports, yet limited and contradictory data are available in trained subjects. The purpose of this study was to examine the relationship between ball throwing velocity during a 3-step running throw in elite team handball players and selected measures of rate of force development like for...

The purpose of this review is to determine how throwing overweight and underweight baseballs affects baseball throwing velocity and accuracy. Two studies examined how a warm-up with overweight baseballs affected throwing velocity and accuracy of 5 oz regulation baseballs. One of these studies showed significant increases in throwing velocity and accuracy, while the other study found no signific...

The fixed duration of a team-handball game and its continuously changing situations incorporate an inherent temporal pressure. Also, the target's position is not foreknown but online determined by the player's interceptive processing of visual information. These ecological limitations do not favour throwing performance, particularly in novice players, and are not reflected in previous experimen...

PURPOSE The main purpose of this study was to compare the effect of a specific resistance training program (throwing movement with a pulley device) with the effect of regular training (throwing with regular balls) on overarm throwing velocity under various conditions. METHODS The training forms were matched for total training load, ie, impulse generated on the ball or pulley device. Both trai...